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How to adjust screen brightness in Ubuntu karmic 9.10 for Dell Mini 12 netbook

Ubuntu 9.10 works better in Dell Mini 12 netbook. The only problem is that I can not reduce the screen light. The FN keys do not function, the Brightness Applet does not work also.

Finally, I found the solution at
http://ubuntuforums.org/showpost.php?p=8612908&postcount=828

To make FN+F9 and FN+F10 keys work on your mini 12 in Ubuntu Karmic Koala 9.10 is just to edit your /etc/default/grub
add the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nolapic acpi_backlight=vendor"

then you need run this at terminal,

# update-grub

Reboot your system.

nolapic allows you to use dell smbios for changing backlight (brightness) in grub.
acpi_backlight=vendor allows to use your vendor's backlight system instead of default video.

If you have other problems, check here: Karmic 9.10 on Dell Mini 12
#1Submitted by Anonymous on Mon, 2010-02-22 20:44.

my mistake. remove "nolapic"

my mistake. remove "nolapic" - the system becames slow because of this. wthout nolapic backlight works fine.